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【单选题】
Mothe r looked ________ when she received our presents.A.
angry
B.
angrily
C.
happy
D.
happily
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【简答题】对A产品的产量(吨)X和单位成本(元)Y进行回归分析,得到回归直线方程为Yc=80-1.85X,则当产品的产量每增加1吨时,单位成本平均减少 元。
【单选题】201 9 年 6 月,甲公司销售产品取得含增值税价款 116 000元,另收取包装物租金6 960元。已知增值税税率为1 3 %,则甲公司当月该笔业务增值税销项税额的下列计算中,正确的是( )。
A.
[116 000×（1＋1 3 %）]×1 3 %
B.
[（116 000＋6 960）÷（1＋1 3 %）]×1 3 %）
C.
116 000×1 3 %
D.
（ 116 000＋6 960）×1 3 %
【单选题】According to the passage, random failures in automatic control systems are 'not merely trivial aberrations' because ______.
A.
automatic control systems are designed by engineers who have little practical experience in the field
B.
the failures are characteristic of systems designed by engineers relying too heavily on concepts in mathematics
C.
designers of automatic control systems have too little training in the ysis of mechanical difficulties
D.
designers of automatic control systems need more help from scientists who have a better understanding of the ytical problems to be solved before such systems can work efficiently
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